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/*
* Copyright © 2006 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#include "drmP.h"
#include "drm.h"
#include "i915_drm.h"
#include "i915_drv.h"
#include "intel_bios.h"
#define VBT_OFFSET 0x1a
/**
* intel_find_vbt - find the VBT
* @dev: DRM device
*
* Loads the Video BIOS and checks that the VBT exists.
*
* VBT existence is a sanity check that is relied on by other i830_bios.c code.
* Note that it would be better to use a BIOS call to get the VBT, as BIOSes may
* feed an updated VBT back through that, compared to what we'll fetch using
* this method of groping around in the BIOS data.
*
* Returns 0 on success, nonzero on failure.
*/
bool
intel_find_bios(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
struct pci_dev *pdev = dev->pdev;
void __iomem *bios;
size_t size;
bios = pci_map_rom(pdev, &size);
if (!bios)
return NULL;
dev_priv->vbt = (struct vbt_header *)((u8 *)bios + VBT_OFFSET);
dev_priv->bdb = (struct bdb_header *)((u8 *)bios + VBT_OFFSET +
dev_priv->vbt->bdb_offset);
if (memcmp(dev_priv->vbt->signature, "$VBT", 4) != 0) {
DRM_ERROR("Bad VBT signature\n");
pci_unmap_rom(pdev, bios);
return NULL;
}
return bios;
}
#if 0
/**
* Returns the BIOS's fixed panel mode.
*
* Note that many BIOSes will have the appropriate tables for a panel even when
* a panel is not attached. Additionally, many BIOSes adjust table sizes or
* offsets, such that this parsing fails. Thus, almost any other method for
* detecting the panel mode is preferable.
*/
struct drm_display_mode *
i830_bios_get_panel_mode(struct drm_device *dev, bool *wants_dither)
{
I830Ptr pI830 = I830PTR(pScrn);
struct vbt_header *vbt;
struct bdb_header *bdb;
int vbt_off, bdb_off, bdb_block_off, block_size;
int panel_type = -1;
unsigned char *bios;
bios = i830_bios_get (pScrn);
if (bios == NULL)
return NULL;
vbt_off = INTEL_BIOS_16(0x1a);
vbt = (struct vbt_header *)(bios + vbt_off);
bdb_off = vbt_off + vbt->bdb_offset;
bdb = (struct bdb_header *)(bios + bdb_off);
if (memcmp(bdb->signature, "BIOS_DATA_BLOCK ", 16) != 0) {
xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "Bad BDB signature\n");
xfree(bios);
return NULL;
}
*wants_dither = FALSE;
for (bdb_block_off = bdb->header_size; bdb_block_off < bdb->bdb_size;
bdb_block_off += block_size)
{
int start = bdb_off + bdb_block_off;
int id;
struct lvds_bdb_1 *lvds1;
struct lvds_bdb_2 *lvds2;
struct lvds_bdb_2_fp_params *fpparam;
struct lvds_bdb_2_fp_edid_dtd *fptiming;
DisplayModePtr fixed_mode;
CARD8 *timing_ptr;
id = INTEL_BIOS_8(start);
block_size = INTEL_BIOS_16(start + 1) + 3;
switch (id) {
case 40:
lvds1 = (struct lvds_bdb_1 *)(bios + start);
panel_type = lvds1->panel_type;
if (lvds1->caps & LVDS_CAP_DITHER)
*wants_dither = TRUE;
break;
case 41:
if (panel_type == -1)
break;
lvds2 = (struct lvds_bdb_2 *)(bios + start);
fpparam = (struct lvds_bdb_2_fp_params *)(bios +
bdb_off + lvds2->panels[panel_type].fp_params_offset);
fptiming = (struct lvds_bdb_2_fp_edid_dtd *)(bios +
bdb_off + lvds2->panels[panel_type].fp_edid_dtd_offset);
timing_ptr = bios + bdb_off +
lvds2->panels[panel_type].fp_edid_dtd_offset;
if (fpparam->terminator != 0xffff) {
/* Apparently the offsets are wrong for some BIOSes, so we
* try the other offsets if we find a bad terminator.
*/
fpparam = (struct lvds_bdb_2_fp_params *)(bios +
bdb_off + lvds2->panels[panel_type].fp_params_offset + 8);
fptiming = (struct lvds_bdb_2_fp_edid_dtd *)(bios +
bdb_off + lvds2->panels[panel_type].fp_edid_dtd_offset + 8);
timing_ptr = bios + bdb_off +
lvds2->panels[panel_type].fp_edid_dtd_offset + 8;
if (fpparam->terminator != 0xffff)
continue;
}
fixed_mode = xnfalloc(sizeof(DisplayModeRec));
memset(fixed_mode, 0, sizeof(*fixed_mode));
/* Since lvds_bdb_2_fp_edid_dtd is just an EDID detailed timing
* block, pull the contents out using EDID macros.
*/
fixed_mode->HDisplay = _H_ACTIVE(timing_ptr);
fixed_mode->VDisplay = _V_ACTIVE(timing_ptr);
fixed_mode->HSyncStart = fixed_mode->HDisplay +
_H_SYNC_OFF(timing_ptr);
fixed_mode->HSyncEnd = fixed_mode->HSyncStart +
_H_SYNC_WIDTH(timing_ptr);
fixed_mode->HTotal = fixed_mode->HDisplay +
_H_BLANK(timing_ptr);
fixed_mode->VSyncStart = fixed_mode->VDisplay +
_V_SYNC_OFF(timing_ptr);
fixed_mode->VSyncEnd = fixed_mode->VSyncStart +
_V_SYNC_WIDTH(timing_ptr);
fixed_mode->VTotal = fixed_mode->VDisplay +
_V_BLANK(timing_ptr);
fixed_mode->Clock = _PIXEL_CLOCK(timing_ptr) / 1000;
fixed_mode->type = M_T_PREFERRED;
xf86SetModeDefaultName(fixed_mode);
if (pI830->debug_modes) {
xf86DrvMsg(pScrn->scrnIndex, X_INFO,
"Found panel mode in BIOS VBT tables:\n");
xf86PrintModeline(pScrn->scrnIndex, fixed_mode);
}
xfree(bios);
return fixed_mode;
}
}
xfree(bios);
return NULL;
}
unsigned char *
i830_bios_get_aim_data_block (ScrnInfoPtr pScrn, int aim, int data_block)
{
unsigned char *bios;
int bdb_off;
int vbt_off;
int aim_off;
struct vbt_header *vbt;
struct aimdb_header *aimdb;
struct aimdb_block *aimdb_block;
bios = i830_bios_get (pScrn);
if (!bios)
return NULL;
vbt_off = INTEL_BIOS_16(0x1a);
vbt = (struct vbt_header *)(bios + vbt_off);
aim_off = vbt->aim_offset[aim];
if (!aim_off)
{
free (bios);
return NULL;
}
xf86DrvMsg(pScrn->scrnIndex, X_INFO, "aim_off %d\n", aim_off);
aimdb = (struct aimdb_header *) (bios + vbt_off + aim_off);
bdb_off = aimdb->aimdb_header_size;
while (bdb_off < aimdb->aimdb_size)
{
aimdb_block = (struct aimdb_block *) (bios + vbt_off + aim_off + bdb_off);
if (aimdb_block->aimdb_id == data_block)
{
unsigned char *aim = malloc (aimdb_block->aimdb_size + sizeof (struct aimdb_block));
if (!aim)
{
free (bios);
return NULL;
}
memcpy (aim, aimdb_block, aimdb_block->aimdb_size + sizeof (struct aimdb_block));
free (bios);
return aim;
}
bdb_off += aimdb_block->aimdb_size + sizeof (struct aimdb_block);
}
free (bios);
return NULL;
}
#endif
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